i have never had a problem with the ethernet feed into my weiss when the lan input is used -- usually issues of this sort are with the service provider modem/router or with the user in-house feed if run through some repeaters or nest pods to get a wired lan connection into an otherwise not-connected room
regarding the weiss 501 mk 2 upgrade it is somewhat expensive and there is improvement sonically but it is subtle -- my sense is that there is even more micro detail unearthed from good recordings, and an enhanced sense of space/spatial cues in recordings, particularly stage depth and ’openness’ ... overall top to bottom balance is not altered as far as i can hear, nor is the ethereal silkiness of the sound (perhaps its greatest strength), despite the tremendous detail one can hear effortlessly

